<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

注册或登录后才能看到的界面

<a href="/user/outUser">退出登录</a>
</body>
</html>